Hydro Quebec uses electro-mechanical meters and does not actually calculate your rate by kWh used in a day for the first 30 kWh of the day. Instead they take the number of days in your billing cycle and multiply that times 30 kWh (so for example if your billing cycle is 30 days, that number would be 900 kWh). They take this amount of usage on your bill and they bill you for that amount at the first 30 kWh per day rate. Then they take any remaining usage above the first 30 kWh per day rate and bill that to you at the next daily rate that you are charged.
There are two ways that you can program this into your monitor:
Hydro-Quebec provides a history of your usage for the past several months on your bill. Most people do not exceed the 30 kWh per day limit. If this is the case, program your unit as a flat rate bill for the amount you are charged for the first 30 kWh and do not use the higher amount.
If your usage exceeds 30 kWh per day, you need to find the average number of days in your billing cycle and multiply this by 30 to determine your first threshold amount. The rest of your usage is billed at the higher amount. If you choose to set the unit up this way your amount will only be an estimate since the number of days in your billing cycle will vary slightly from one billing cycle to the next. Your kWh usage should be accurate, however your bill amount may not match due to these variations in your billing cycle.